Objective:
Perform coupled measurements of soil hydraulic properties and colloidal breakthrough in soil columns for the further interpretation of results using soil computer tomography data to quantify connectivity in soil macropores.

Approach:
Will measure soil water retention, soil hydraulic conductivity, bacteria or colloidal microsphere breakthrough, and conservative transport breakthrough in soil columns for which the computer tomography was performed. The research will be conducted in a phased approach according to the following three tasks. 1) Measure hydraulic properties of the tomographed soil columns; 2) Perform the column breakthrough experiments with bacteria or colloidal microspheres; and 3) Schedule of the research and reporting.